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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550ec24c8539227cbc86fdb6461f603f48a1a90263d65598173d967988d72268' 
  AND token = 'C/a3l/uABuRz+RAeihH/QwtJ9c2Be51gtDRE9DuFhH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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