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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14550aa1151dc823526186edbabc03010dc3c3130001b18f11dd0a984443b35' 
  AND token = 'kEqq+r9w5/pCXvlww4vdbHbN8jvYJLI5ax0lSNMym5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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