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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b08090efb64a4457ed8133ac5e26dc433000fb068c0902f4282494bd2dbdc32' 
  AND token = '6rz8LX3prrJig7mxc+9LDyDoHDQwaFQRJHlB1ZoXqu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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