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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637bb690a022181ad60f8565099b0a7429ea4297e96cbc6bf694f85c4b534083' 
  AND token = '3PmKV5VRb1hEi2b599YWa564Tx0KJE+BJC2wZgR38H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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