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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd047e42df3c589f47bfb6bb63b2588350f4b1976dccdc7d352fca211fbe07bd9' 
  AND token = 'tgRJF92og6PCiCpv3eKPUua1Um/lxyxyMVW1cgiRO9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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