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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897b026bfab61c1ac094070e2d98875ae4459928fd6adc315a77d0363cec3ecc' 
  AND token = 'MQfoHP8SbqVK7d4MtFi9Pa5c5xIVStsw39upfa6+tKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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