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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c92dc3f20dd6d0aa734e24557ef023fa60f53489218b9467ea30059a6075a77' 
  AND token = '2g6N+BR6rYxgEcQpuFY8FDZJSE7BTHT0/bPJYGp7XCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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