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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6292d1efce03e25e8504e1647f07dc795aa14af9c5c0bd2e8c989790cc71f38' 
  AND token = 'OwkkGqCdfYYyfCo9fl1m4h4dFX90V8GFhkUoeX67LD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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