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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740b50b01b7eb89b929cbe3e817bf7cde7f316ebee1bd10d523aaedbc3735a5b' 
  AND token = 'n2lIs/xoiq+tu55vXNEikuzS4ngTOs8DiXxnLTFpD4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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