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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6997d849b6c7f5523123813255d1e70640d6ff3457cfc75c7838f5abcba697' 
  AND token = 'bTR4C+uEkd8wTBkFtH24rV2ux6x6hmlMCI1nQj0hrU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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