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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44b1882249103a8fc283d3bb1b8c7b0b80fa4fde979b9bcf915d10a4179a95f' 
  AND token = '3FLDOpyvQ4zGU1oHoemiCVi2TBH+UVxivwDBL8QP1KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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