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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967570b807110d9f19ce81591a1e1f61971df217b46ce62b3f7105053bd6de27' 
  AND token = '+9QpCrQxdfR9lvUpwXtKdGJu3xjGXEWnWYENteRRLHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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