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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ac8650e1d3c16b655aa57aaec33bab2bf77fad9f64666b66ab4e15a694e8e5' 
  AND token = 'wA/gXJVO7b+5RG+1tZfjjgqXblFAOd9HnV0SqUdtT+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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