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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6470a8e1ed91f8f3f143b58b2443b4102b803624f441b0d70e64ec5759988dc' 
  AND token = 'yIW5hcB5042FkgKXu6oKntuIpk6Z5So8Lb/xIG/9qgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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