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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6c902726f60fd104532bd5f0edc0459d0f3f31c2892eb78db1de6d1f585e9a' 
  AND token = '8LNjm465oKpRyD0ae0GQZ9t0Uwz6X7zr4BAzMX4UtGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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