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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2ce027cf9a1e6ad940a2b92aa51076bbcad6f210c58fb499be28b41aee58a8' 
  AND token = 'R5pvmYHekAx0tBpmgmK3rmZMeWHnsJDIHZwueeCEERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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