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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866f960ef6fa6c6e0b7dc41c2d48c45d941d66b31b27a663f39cb8573eb97d7c' 
  AND token = 'KPVOg3m74C9olB7RSbN/Of14ZQ5pu7rG275hNKR6zCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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