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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee60cbba8d1020121b76329eef05ba6d1673ecbd403e0a0c621631990e695e2' 
  AND token = 'ghi5eM9rfQCEm70bUBr2x1NfiS6WRrptNvQkceeuahs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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