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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf989d81fd51e6e5aba36111c57cce4c557e6fa8a6905f3d01c8f125f5e3cdf' 
  AND token = 'jDlzql+lDBrPNdHN08RRdJEXpw9+eY4uy0hR9Ed77ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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