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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e20398ef87b750aae89bbf3225599bcd3c59c9195fa4df7b633ba5cc0d45ac' 
  AND token = 'eWmPogOzU2Xka3F58XI49uV4g/LdheVnjuM0VQ6o5sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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