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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848486219dc0278e6e0bcd771d41a16dba2ec0710f7a826214f86d433ffb5383' 
  AND token = 'gP8xggIpLJ1J17CiGV/SVbdNGY2z/Kc0wFHnlf7aN4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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