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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e680384c2b9f7f1ef92020bda92272be0fea7e4a744b581aed623b1f9b12be5b' 
  AND token = '9dC/dQ9y8JdpNcaG6fYkrKuR1UoHmzy/M8yBfTCMUb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}