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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ab4defd90e08fd4a84ec66ebb23e787a5fa2e0cb137cfcf5ce28bf5efeed00' 
  AND token = 'Fty2zM2E8DsbNDJqc1yEn6qZcKwvuPiVGw07K/5L2IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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