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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2a35196568ccf02e811c799cb13a396e67a5f6713c9c0e5284f929ecc932f0' 
  AND token = 'DX7pzgCuz+frPwTz0oblqxDGYReLCPsYbgpBl7XQFEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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