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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120a229df9970fbcbbf71762f3e74e7ac00c6e2dfd20bcf80ad2a5818b56f456' 
  AND token = 'zGzanCJKWQxSNZ/9Q0M3iA6twEt0B09te/qad9KidMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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