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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a283a1e1ffe45a69e2c6efa5e467913da8f525a0fd582bb2fc3ae75795e7d9' 
  AND token = 'bGiuPU+AGFwDMR8AvGEUfpl+TocaBnw9B7NJ1pzAAp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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