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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4737eefa91d0937fb2726ea1a3a9c86102b3f767edd3d7606d425ac0ad02706' 
  AND token = '3Ep477CI52t9aPvMZ/Wyt7tEC3C7NSC8m0/9rxI6T8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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