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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87daa0f85c07ef51173233d5025a881f489f3dba2dc7491b9971d7c776c580ed' 
  AND token = 'Ka1dvpy7N7vm5uJgtS1wEUt/Fx5aUuShx384viXYLNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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