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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84810c68d240bb07c4c0a69a1d3d42cd6fe19818beb67fceb23de83d8909fa7' 
  AND token = 'oBctHo/qkrQCauq7d2FVg3M1tg3mY6o8ohLrE8ZO2Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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