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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4276ddaecd2264640d1cfd917a239cf1b89f39f6915a5d7851718ed6878e0039' 
  AND token = 'LlLjdfQ1ZuXvQjy6vAIhp9+1Ia5Xw6RX8L8F6nuWFsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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