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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cff103260259a51441fd3127260bc1787f2462de34c12bd16e8626be4e4d368' 
  AND token = '6jmE2Y+b9PGZ35BG034xDxaISUf38qMn6ttFFVpcRGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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