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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce98658ac824e612dde5f9e22d331e5977711f06b0f23b714732095414dcc52' 
  AND token = '6yhCLZ3QC+tVM3ZoVYoA3QJx8iCsnniNST4NlSeHpeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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