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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5407d9fa3416c5af2c81eeca177d64a8e1a6bf1f88266f5f6516e0a186cfafbf' 
  AND token = 'ah5oq5wpqR2frNZnqMJvI1JRMMAbJ9RXAaHc35wERAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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