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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a51b2cae9e0655cbb9c00ce5fc0d9965eb87d6f0a9b8a1a7e44dc0a7392f32' 
  AND token = 'QdHoC/NF8xzXTkXaAbRX7yTk7eoAbnurwOHuVqMoouk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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