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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2877cdf49a7060b0ea444d0f39f239c8ef734f07a9a5eb8c1c0f92f9389d0d' 
  AND token = '/wyALtcivBKPkUk5d9xUbRXdkv+CeKHQ8qbaRRbLWAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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