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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96aae2d6aaa77a56cf0b89d43e605a6ea727ef7c08990b8d0fab69cd0f94218e' 
  AND token = 'tuSaNQIkNAsrtskiAfg39O7QjnM1todDenYLWeqARoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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