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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c124a4b4218105ee90e87845dcb434abed59cbf22da1ae8b373cdd021c3d8f' 
  AND token = 'o3+4b9klw6dx7Xv96ofTaQWsrnPm4H0rhBQxnn8q+6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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