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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef97ba846378a190bade87f2bba5b5acf7f596b99230b067f967cfd8d01f8055' 
  AND token = '3FE7JVpFx7wExEJpQbui8ND5Cf4H/CMfnExjBr6w5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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