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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd27cb79ea0cd1266b2d4e26af5b20512c64c6e029cb0d30258e11d871d2ff0' 
  AND token = 'N7SwnUIn068ejhSwBSt8cohNdhXkdbC0+YLI2L3BBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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