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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce2ab5b7bab6752b46af7890c308fea1a5aa8b45a6b84106fc7d6dc3f4d7e8' 
  AND token = '6Rft7l8iAsTv8F1EGPROvXcsZuEDSYBWFX4NrrNwGqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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