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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec432b5b52d8274c621ce8b9ae8a727890382a8a82b723dd2ba193051e8dc2f' 
  AND token = '4VL01roD4BqRb/fTM4J3T39dAQKH8gayPakUFpRQovs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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