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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1605606d853a1d68a599cdb565d766ac16d255f9a916b5152ded7f3974328d7b' 
  AND token = 'giNAvi2vPOn4QFEN6t3Z9le8tAxQwjvOoawYKva6wyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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