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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a31e1d756784888f3d9c24bf06882b78a87f05abd254b5e401f33ca194027f0' 
  AND token = 'RxyJG0NjrsY8CnMkFe8Dp8yrysgSyV5uL+3O7dIwX2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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