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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf2d3502590ee40ceb56aa0ed631ab9f10357920c4d6abfb638633c4619601b' 
  AND token = 'C+t2vxo9HHRFcJev1Whes2i+o1zirAui8ZXDzOC+cZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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