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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1702e016574cb1a6006d0e76021536f85eb1d51d5260bda60d2b0ff23ef8bb8' 
  AND token = '+4A/eyr29CJjLs3lnCmtmGOCDkjttf/LQj23OA7y9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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