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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edabbffd099365cd6ea76d00d972793a5ef05fa222765eab3081976fe32895a5' 
  AND token = 'YWkgvTHTE/K4V6y9FzHoEiuuab1dJZmsZC7Lw0wk49E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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