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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6909c78567b08997c04e5bcaf09938ab99cf39a13c85d36bd3ba3f0626395412' 
  AND token = 'eGxc6tf3JilpjupPHhfyE5gkaV5vtSy56IDM2AdW0Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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