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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc05fc57327b2ea0051a3e4f2ccac7e0adffc88d3af4a5e2f002afd60411311' 
  AND token = 'p5Q62oyWqUOxuniqtjKkj3E96jXGM16GyShwmUSxF3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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