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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2a5f1180c8b58063576f3330133b3c3aef9221ec3efc13324a8b06bf176c97' 
  AND token = 'ovT+gxghufnJrNqSAya2tzYzYhilUhFnjgqPycWasAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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