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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942f1f1e1d784b414a4a39b4ba81214b0a00e07413a448a617d9dcadc2ad96b2' 
  AND token = '6I8ZAGlz/bbkxQ77vdRd8qqlgDvgnhTjuHUfGaaKX4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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