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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5eab0637f6af6254e2961629dd6696742fe8ef344710bca668bbf562a37fd4' 
  AND token = 'MIK5j1QTVmgrKYrOtA/cSy+3Wyr7bbJBPR2ZRbYdCac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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