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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e937ce2e54172947ebaf08bba84667fe6fc76b592ff166c15ff9dda3b226ee4' 
  AND token = 'HMhd44C2EXaZoeGJiBdl9ys7JGRgts5/gelruem7QdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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