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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e130a4a1586eb3b18f55c8aa1f26729829ccbfb52051422235939552ce80b9' 
  AND token = 'ufmZj4Gz46622olET0wGNaM7FHgsMJ4UgWoKpEkEqv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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