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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa33928096f27f1f622b1ed0302de61926d12db82594f5b3bd504e2bfcccf6cf' 
  AND token = 'wR5CSv9rNGCK4Fb50dXSAsgS3IknKv7IiWfb+diwsbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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