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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a01b222dc8815e4a94f3b5e01cace6f5f158d43cbc8987361193f8ebe6e622' 
  AND token = 'SRelXmX314BdYlaX9LlCukAbLnMJGW8PDYfztggAiFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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