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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52c3c5cc9e3e288f091b39b2b62d80d06c5c25419dd72fb1c9f768b5bb13c85' 
  AND token = 'ZppXNBNemcc5EOZ442IuEkkoYfZYczlF9Nqd17MDA/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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