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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d44047b9f666ac85e43cfa2613d83ac9d4e9c8779d639dc57cfcb57d46e73' 
  AND token = 'cE0zq6+P4PmmHvoV/VjncwhzX4REQwYTe4znjDADJ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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