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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43a62646a3248d5e0267bdb771a8eaf7c958e3f709274b18833ab8a3977fb7d' 
  AND token = 'WZSqbUqVHyIoERWz9ogBx/gMx5WQtKlmrPMq3pkP5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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