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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95f85708c4ec10fc3c18a470a1ec0f23841a3f33d14fca38ff9b3ee82b5ae73' 
  AND token = 'oxHP2oYxcjBfKQHIeyzlFoB2m8U2401voNnSCjg4tuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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