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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ce0a9c3cbadf8b441511390e3956f9cc5f5bf14f91c13d702ed8e2d784adc7' 
  AND token = '8sGPKLy90avLboxbdLyWsbndD2SZZPV/oPtZtJ5NIe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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