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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f3d48c875aba82dd670f6b1161c225f0a31eb80bfd0035a22d8633328ac8c7' 
  AND token = 'EWlSEty4WVN/QVTINxvGQ1r21FVind1CQ6Mamujobi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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