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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3c418cbe1caa9a6ec251903f857ccb2fc59b5dcf4230ef52adbcaba579f6d4' 
  AND token = 'W8yULjtL5SUmHhh731fen7wlBg0NSp1e9HatshDlx1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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